Rolling-mill apparatus for making hollow bars



W. JENKINS.

ROLLING MILL APPARATUS FOR MAKING HOLLOW BARS.

APPLICATION FILED IAN.3, |920.

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ROLLING MILL APPARATUS FOR MAKING HOLLOW BARS.

APPLlc/mon FILED 1AN.3. 1920.

1,386, 1 15, Patented Aug. 2, 1921.`

3 SHEETS-SHEET 2- -|l 65 64 W ATTORNEY W. JENKINS.

ROLLlNG MILL APPARATUS. FOR MAKING HOLLOW BARS.

APPLlcATloN FILED 1AN.3, 1920.

1,386, 1 1 5 Patented Aug. 2, 1921.

3 SHEETS-SHEET 3- WITNESS:

7' iw TOR W ffm A TTORNEYS venience UNITED STATT- 1s PATENT oFFlcE.

WESTON JENKINS, OF ROME, NEW YORK, ASSIGNOR T0 ROME IRON MILLS, INC., A

v CORPORATION 0F NEW YORK.

ROLLING-MILL APPARATUS FOR MAKING HOLLOW BARS.

Lasalle.

Specicaton of Letters atent.

Patented Aug. 2, 1921.

Application led January 3, 1920. Serial No. 349,297.

To all whom t may concern:

Be it lrnown that I, l/Vns'roN JENKINS, a citizen of the United States,v residing at Rome, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Rolling-Mill Apparatus for Making Hollow Bars, of which the following is a specilication.

rIhis invention'relates to a rolling mill for making hollow bars, and it has for its general object the provision o t apparatus for handling the bars whereby maximum conand expedition are obtained. More particular objects of the invention are, the provision, in a three high mill, of a supporting table pivoted so that one end may be raised or lowered to bring it opposite the passes between the rolls; the provision of a cam mechanism for raising and lowering the table; the provision orn a mandrel and suitable support-ing meanstherefor which. may be retracted and advanced whenever the table is raised or lowered; the provision ot means tor adjusting the position of the mandrel; and the provision ot'means for forcing the bar between the rolls. It is also the object of this invention to provide all of the above features in a single machine which can be conveniently operated by one man. These, together withv such other objects or advantages as may hereinafter appear or areV incident to my invention, I obtain by means of a construction which I have illustrated in preferred form in the accompanying drawings, wherein;

Figure l is a longitudinal section through a rolling mill embodying my improvements, on the line l--l of F ig. 2; Fig. 2 is a section on the line 2-2 of Fig. l; Fig. 3 is an enlarged -front elevation of the rolls which are employed looking in the direction of the-arrow 3-3 in Fig.y l; Fig. l is an enlarged section 'transversely of the sliding support for the mandrels taken on the, line I l of Fig. l; Fig. 5 is asection on the line 5-5 of Fig. l; Fig. Gis section on the line 6 6 of Fig. 1; Fig. 7 .is a section on the line 7-7 o1c Fig. l; Fig. 8 is an enlarged longitudinal section through the. outer end ot the table illustrating the manner in which the support for the mandrel is pivotally fastened to the table; Fig, 9 is a section. similar to that of Fig. 8 taken at aslightly different point and showing the support for the mandrel; and` Fig. l0v is a transverse section through the end of the table further illustrating the manner in which the support for the outer end of the mandrel is pivoted to the table.

By referring lirst to Fig. 1, it will be Seen that I prefer to employ a three high mill having the rolls 8, 9 and vl0 which may be Y driven by any suitable apparatus not shown.

These rolls form a series of passes of gradually decreasing size from the largest pass which I have numbered 11 in consecutive order toY the smallest pass which I have numbered 22. (See Fig. 3). I prefer to revolve the rolls in the direction indicated by the arrows in Fig. 1 and to force the bar first through the pass ll between the rolls 8 and 9 and then back through the pass l2 between the rolls 9 and l0 and so on throughout all the passes until the bar has been rolled to the desired shape and size. It will, of course, be understood that I do not limit myself to rolls having passes of the configuration shown, as it is perfectly obvious that any shape desired may be used.

The table 23 opposite the rolls is attached to and supported by two rails 24 and 25 which are pivotally supported at 26 upon the casting 27 so that the end of the table adjacent the rolls may be raised or lowered so that it may be brought opposite the passes between the rolls 8 and 9 or opposite the passes between the rolls 9 and 10.' This table is provided with guiding and'supporting grooves 28 which more or less accurately correspond in shape and size to the various passes between the rolls which they come opposite. (See Fig.r2).

mandrel 29 is preferably provided for y each kor the grooves in the table and upon the. ends of these mandrels are balls 30 of varying sizes dependingV upon the diameter of the hole which it is desired to form in the bar. These Vballs are held by the mandrels in approximately the center of the passes between the rolls and the bars are rolled over these balls and on the mandrels or off the mandrels and over the balls as the case may be. I have shown in Fig. l 'in dotted lines a bar 3l in the process of being rolled olf the mandrel 29 and over the ball 30 between the rolls 9 and l0.

The mandrels must be initially supported at both ends and in such manner that adjustment of the balls may be readily made and that no interference to the threading on 'of a bar will be presented. In addition to this, the mounting for the mandrels must be provided with means for holding them in a fiXed position on the table during a rolling operation, but which, at the same time, will permit their ready release in order that they may be retracted andl advanced whenever the table is moved up or down. I accomplish this in the following manner. ,At the ends remote from the rolls this support for the mandrels consists of a slide 32 which is vadapted to move back and forth on the rails 24 and 25. This slide is provided with a double row of 'Ll-shaped supporting slots 33 spaced apart and corresponding in size to the passes between the rolls and thegrooves in the table. The ends of the mandrels supported in this slide have threaded upon them two nuts 34 and 35 which fit between the two rows of Ushaped supports and whichr are adapted to abut against the inner surfaces thereof. By means of these two nutsv the position of the ball at the end of the mandrel may be adjusted. rlhe slide is moved back and forth upon the rails-by means of two shafts 35 andv 37, each provided with a collar 3,8. The slide is properly bored for the bar and counterbored for the collar and assembly. is .accomplished by means of the removable plates 89, see Fig. 4, held in place by `bolts 40. The forward ends of the shafts 36 and 37 project into suitable openings in a casting 41 secured both to the table and the rails and the ends of these shafts 36 and' 37, are provided with lugs 42 and 43. (,SeeFig. 5.) From this ligure, it will be seen that with the lugs in the position. shown7 the shafts and 'consequently the slide which they carry, are releasably locked in a fixed position with respect to the rails and the table. But if the shafts be turned through an arc of 900, the lugs will come opposite similarly shaped openings 44 and 45 in the casting 41 and could then be readily withdrawn to permit'movement of the slide. These shafts are turned by means of bushings 46 fitted thereon. @n the interior of these bushings is a lug 47 which fits into an inclined slot 48. in the shaft. Each bushing is provided with laterally projecting pins 49 which extend between the prongs of a forked operating lever 50 piv oted at. its lower end on the pivot rod 51 which is journaled in casting 52. It will thus be seen that if the arms 50-are moved on the pivot rod51, the shafts 36 and 37 will be rotated Ione quarter lof a turn when the pins 447 will abuty against the rear end of the inclined slot 48 and the lugs 42 and 43 Vwill be in position to enter'the openings 44 and 45. Movement of the arms 50 takes place simultaneously with the raising or lowering o'f the table, the apparatus for accomplishing which will now be described.

A casting 53 secured to the table rests upon Ya cam 54 which is revolved on its pivot 55 by means of the fiuid operated piston 56 and link 57. Keyed to the main shaft upon which the cam 54 rotates is a toothed quadrant 58 which engages a small pinion 59 journaled on the rod 60. The ratio between the quadrant and the pinion is such that with each movement of the cam to raise thel table to its upper position or to lower it to its lower position, the 'pinion will make one complete revolution. Ihe pinion 59 is fixed to the rodv @Oron each end of which is located a crank V61 and to these cranks are connected operating rods 62. The other ends of these rods extend to cranks 63 at each end of the pivot rod 51. It will thus be seen that Vwith each complete revolution of' the pinion 59, the rod 62 will move the arms 50 toV their extreme rear position and then forward again to theL position shown in Fig. 1. 'Y

When the bar is being rolled'olf the ma dreh andiball, it isadvisable to providersome means for initially forcing it between the rolls until such time. as they obtain a grip upon it. In order to accomplish this I provide a series of pushersv which, in this embodiment of the invention, take the form of grooved shoes 64. These shoes fit into the grooves. in the table and the mandrels are adapted to pass over or through them. They are 'moved by meansof long rods 65 which I have shown as operated by means of a fluid pressure actuated piston in the cylinder 66..' rlhe forward end of the mandrel must be supported in some manner which will not interfere with the bar when it isbeing threaded onor off the mandrel. This, I- accomplish by providing a socketed arm 67l which engages the underside of the forward end of the mandrel and which is -pivotedupon a. pin 68 suitably journaled in the forwar'dendvof` the ltable 23 and held in place by meansrof a plate (S9-and screws or bolts 70. The arm 67 is under the control ofthe operator through the medium of the lever 71 'and rod 72. `When the arm is in inoperative position its upper end will rest in the socket 73 formed inthe forward part of the table 23.

The operation of the device is as follows, assuming the table to have been in its lower position indicated in dotted lines in very diagrammatic form at 74. In this position of the table, the ball'SO on the end-of the mandrel would be at the inner end of the dotted line 75 between the rolls 8 and 9. A.4 bar is then introduced between the rolls 8 and 9 and is rolled over the ballBO and on the mandrel 29. When the pass has been completed, it is necessary to raise the end of the table and roll the bar off the ball 30 between the rolls 9 and 10. The mandrel 29 must be retracted asulficient distance to clear the roll 9 and again thrust forward to enterthe pass between the rolls 9 and 10. The ball will follow approximately the curve of the dotted line 7 5. As the table is being raised by the cam 54, the quadrant 58 will turn the pinion 59 until it makes one complete revolution during the first half of which the rods 62 will be moved toward the rear and with them, the arms 50, shafts 36 and 37 and slide 32 which carries the mandrels. During the second half of this complete revolution of the pinion 59, the rods 62 will again be moved to their forward position thereby returning the arms 59, shafts 36 and 37 and the slide 32 to their forward positions. On this return. movement provision must be made for preventing the rotation of the shafts 36 and 37 until such time as the lugs 42 and 43 have passed through the openings 44 and 45 and are in position to be turned so as to lock the slide to the tableu This, l accomplish by providing two horizontallydisposed keys 7 6 in the shafts 36 and 37. When movement to the rear rst begins, these keys are in the position shown in Fig. 6, but as soon as the shafts 36 and 37 have been rotated to the position where the lugs 42 and 43 enter the openings 44 and 45, they will be in proper position to enter -the openings Y? 1n the casting 78 which is fixed to the rails 24 and 25. Therefore, when forward movement begins, no turning of the shafts 86 and 3T is possible until such time as the lugs 42 and 43 reach the position where they may be turned to lock the slide to the table, and when this position is reached, the keys T6 have been withdrawn from the openings 77.

By means of the operating lever 'T9 for the cylinder 66, the operating lever 8O and rod 8l for the cylinder which operates the piston 56, and the lever 71 and rod 72 for operating the forward support 67 for the mandrel, the machine can be conveniently handled by one man. This arrangement results in a great saving of labor.

The machine is located over a suitable pit 82 in which various parts of the operating mechanism are disposed.

l claim l. A three-hi0fh rolling mill for makingY b b o hollow bars comprising in combination a table, means for raising and lowering the table, a mandrel, and means for retracting ano advancing the mandrel upon movement of the table up or down, said means being under the control of the table actuating means.

2. three-high rolling mill for making hollow bars comprising in combination a table, means for raising and lowering the table, a mandrel, and means for retracting and advancing the mandrel upon movement of the table up or down, said means being under the control of the table actuating means, and releasable means for locking the mandrel to the table during a roll ing operation, said last mentioned means also being under the control of the table aotuating means.

3. A rolling mill for making hollow bars comprising in combination a table adapted to be raised and lowered, a mandrel adapted to be advanced toward and retracted from the rolls and common means for raising and lowering the table and for advancing and retracting the mandrel.

4. A rolling mill for making hollow bars comprising in combination rolls, a table, a mandrel, a movable carriage for supporting the end of the mandrel away from the rolls, and a support for the end of the mandrel adjacent the rolls pivoted so as to be readily moved out of the path of the bar during a rolling operation, and means for returning the support to its operative position.

5. A rolling .mill for making hollow bars comprising in combination, rolls, a grooved table for supporting and guiding the bars, a mandrel in the groove, a shoe in the groove for forcing the bar toward the roll, said shoe being formeel to permit passage of the mandrel, and means for operating the shoe.

6. A rolling mill comprising in combination, rolls, a pivoted table, a mandrel, a movable support for the mandrel, means for moving said table on said pivot, and releasable means for locking the mandrel support to the table during a rolling operation, said means being released by movement of the table.

7. A rolling mill comprising in combination, rolls, a table, means for moving the table, a mandrel, a sliding support for the mandrel, a shaft for moving said sliding support and the table provided with coperating means for locking the sliding support to the table and with other coperating means for preventing rotation of the shaft, said means for preventing rotation of the shaft being operative whenever the locking means is inoperative, and means for rotating and moving the shaft.

8. A three-high rolling mill for making hollow bars comprising in combination a table, means for raising and lowering the table, a mandrel, and means whereby retraction and advancement of the mandrel by movement of the table up or down is accomplished.

9. A three-high rolling mill for making hollow bars comprising in combination a table, means for raising and lowering the table, a mandrel, and means whereby retraction and advancement of the mandrel upon movement of the table 'up or down is accomplished, and releasablc means for locking the mandrel to the table during a rolling operation.

10. A rolling mill for making hollow bars comprising in combination rolls, a pivoted table, a pusher for forcing the bars between the rolls mounted on said table, and means said means and the table being provided With for operating the pusher. cooperating means for locking the support 1l. A rolling mill comprising in combinato the table during a rolling operation. tion, rolls, a table, means Yfor moving the In' testimony whereof I have hereunto l0 5 table, a mandrel, a movable support for the signed my name. mandrel, means for moving said support, WESTON JENKINS. 

